Visit the local government of the city or town that you believe one of your ancestors was born. If the location is far away, you can see if they have an online website with genealogy information.
You may be able to find free family crest information, free family tree information or free information about your ancestors, directly from the source.
You can look up free social security death index information, free birth certificate information and free marriage information. You may have to pay a small fee if you want a copy of something printed out for you, but you can look at the information for free.